Mounting support



FIG. 1 is a top, front, right side perspective view of the mounting support showing my new design;

FIG. 2 is a top, rear right side perspective view thereof;

FIG. 3 is a top, right side perspective view thereof; and,

FIG. 4 is a bottom, rear, left side perspective view thereof. 

The ornamental design for a mounting support, as shown and described. 